>library(ggplot2)
> transmission<-factor(mtcars$am,levels=c(0,1),
+ label=c("Automatic","manual"))
> qplot(wt,mpg,data=mtcars,color=transmission,shape=transmission,
+ geom=c("point","smooth"),method="lm",formula=y~x,
+ xlab="weight",ylab="Miles Per Gallon",main="Regression Example")
错误: Unknown parameters: method, formula


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